handle labels

app/models/repository.rb

@@ -69,6 +69,76 @@ def ensure_label_missing(label)
     true
   end
 
+  ##
+  #  Fetch the Labels for this Repository from GitHub
+  #  and create it in our database
+  #
+  def labels
+    @labels ||= begin
+      Github.client.labels("voxpupuli/#{name}").map do |label|
+        Label.find_or_create_by!(name: label[:name],
+                                 color: label[:color],
+                                 description: label[:description])
+      end
+    end
+  end
+
+  ##
+  #  Find all Labels which are in our config but are missing from the
+  #  Repository on GitHub
+  #
+  def missing_labels
+    required_label_names = VOXPUPULI_CONFIG['labels'].map do |label|
+      label['name']
+    end
+
+    label_names = labels.pluck(:name)
+
+    missing_label_names = required_label_names.reject do |name|
+      label_names.include?(name)
+    end
+
+    missing_label_names.map do |name|
+      Label.find_by(name: name)
+    end
+  end
+
+  ##
+  #  Create each missing Label for the repository on GitHub
+  #
+  def attach_missing_labels
+    missing_labels.each do |label|
+      ensure_label_exists(label)
+    end
+  end
+
+  ##
+  #  Compare the Labels on GitHub with the ones from our config
+  #  If we have the Label in our config but the color or
+  #  description differs we update the Label on GitHub to match the config.
+  #
+  def sync_label_colors_and_descriptions
+    config_labels = VOXPUPULI_CONFIG['labels'].map do |label|
+      Label.new(name: label['name'],
+                color: label['color'],
+                description: label['description'])
+    end
+
+    labels.each do |label|
+      config_label = config_labels.select { |c_label| c_label.name == label.name }.first
+
+      next unless config_label
+      next if (label.color == config_label.color) && (label.description == config_label.description)
+
+      Github.client.update_label(github_id,
+                                 config_label.name,
+                                 {
+                                   color: config_label.color,
+                                   description: config_label.description
+                                 })
+    end
+  end
+
   ##
   #  Fetch all open and closed PullRequests and sync our database with them
   #

app/workers/index_repos_worker.rb

@@ -23,5 +23,6 @@ def perform
     end
 
     RepoStatusWorker.perform_async
+    SyncLabelWorker.perform_async
   end
 end

app/workers/sync_label_worker.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class SyncLabelWorker
+  include Sidekiq::Worker
+
+  def perform
+    Repository.each do |repository|
+      repository.attach_missing_labels
+      repository.sync_label_colors_and_descriptions
+    end
+  end
+end

db/migrate/20200426200729_add_description_to_labels.rb

@@ -0,0 +1,5 @@
+class AddDescriptionToLabels < ActiveRecord::Migration[6.0]
+  def change
+    add_column :labels, :description, :string
+  end
+end

db/schema.rb

@@ -10,14 +10,15 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_08_24_091954) do
+ActiveRecord::Schema.define(version: 2020_04_26_200729) do
 
   create_table "labels", force: :cascade do |t|
     t.string "name"
     t.string "color"
     t.integer "pull_request_id"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.string "description"
     t.index ["pull_request_id"], name: "index_labels_on_pull_request_id"
   end